/******************************************************************************* | |
* Copyright (c) 2004, 2008 IBM Corporation and others. | |
* All rights reserved. This program and the accompanying materials | |
* are made available under the terms of the Eclipse Public License v1.0 | |
* which accompanies this distribution, and is available at | |
* http://www.eclipse.org/legal/epl-v10.html | |
* | |
* Contributors: | |
* IBM Corporation - initial API and implementation | |
*******************************************************************************/ | |
/*nlsXXX*/ | |
package org.eclipse.wst.css.core.internal.contenttype; | |
import java.io.IOException; | |
import java.io.Reader; | |
import org.eclipse.wst.xml.core.internal.contenttype.EncodingParserConstants; | |
import org.eclipse.wst.xml.core.internal.contenttype.XMLHeadTokenizerConstants; | |
%% | |
%{ | |
private boolean hasMore = true; | |
private final static int MAX_TO_SCAN = 8000; | |
StringBuffer string = new StringBuffer(); | |
// state stack for easier state handling | |
private IntStack fStateStack = new IntStack(); | |
private String valueText = null; | |
public CSSHeadTokenizer() { | |
super(); | |
} | |
public void reset (Reader in) { | |
/* the input device */ | |
yy_reader = in; | |
/* the current state of the DFA */ | |
yy_state = 0; | |
/* the current lexical state */ | |
yy_lexical_state = YYINITIAL; | |
/* this buffer contains the current text to be matched and is | |
the source of the yytext() string */ | |
java.util.Arrays.fill(yy_buffer, (char)0); | |
/* the textposition at the last accepting state */ | |
yy_markedPos = 0; | |
/* the textposition at the last state to be included in yytext */ | |
yy_pushbackPos = 0; | |
/* the current text position in the buffer */ | |
yy_currentPos = 0; | |
/* startRead marks the beginning of the yytext() string in the buffer */ | |
yy_startRead = 0; | |
/** | |
* endRead marks the last character in the buffer, that has been read | |
* from input | |
*/ | |
yy_endRead = 0; | |
/* number of newlines encountered up to the start of the matched text */ | |
yyline = 0; | |
/* the number of characters up to the start of the matched text */ | |
yychar = 0; | |
/** | |
* the number of characters from the last newline up to the start | |
* of the matched text | |
*/ | |
yycolumn = 0; | |
/** | |
* yy_atBOL == true <=> the scanner is currently at the beginning | |
* of a line | |
*/ | |
yy_atBOL = false; | |
/* yy_atEOF == true <=> the scanner has returned a value for EOF */ | |
yy_atEOF = false; | |
/* denotes if the user-EOF-code has already been executed */ | |
yy_eof_done = false; | |
fStateStack.clear(); | |
hasMore = true; | |
// its a little wasteful to "throw away" first char array generated | |
// by class init (via auto generated code), but we really do want | |
// a small buffer for our head parsers. | |
if (yy_buffer.length != MAX_TO_SCAN) { | |
yy_buffer = new char[MAX_TO_SCAN]; | |
} | |
} | |
public final HeadParserToken getNextToken() throws IOException { | |
String context = null; | |
context = primGetNextToken(); | |
HeadParserToken result = null; | |
if (valueText != null) { | |
result = createToken(context, yychar, valueText); | |
valueText = null; | |
} else { | |
result = createToken(context, yychar, yytext()); | |
} | |
return result; | |
} | |
public final boolean hasMoreTokens() { | |
return hasMore && yychar < MAX_TO_SCAN; | |
} | |
private void pushCurrentState() { | |
fStateStack.push(yystate()); | |
} | |
private void popState() { | |
yybegin(fStateStack.pop()); | |
} | |
private HeadParserToken createToken(String context, int start, String text) { | |
return new HeadParserToken(context, start, text); | |
} | |
%} | |
%eof{ | |
hasMore=false; | |
%eof} | |
%public | |
%class CSSHeadTokenizer | |
%function primGetNextToken | |
%type String | |
%char | |
%unicode | |
%ignorecase | |
%debug | |
%switch | |
UTF16BE = \xFE\xFF | |
UTF16LE = \xFF\xFE | |
UTF83ByteBOM = \xEF\xBB\xBF | |
//SpaceChar = [\x20\x09] | |
// [3] S ::= (0x20 | 0x9 | 0xD | 0xA)+ | |
S = [\x20\x09\x0D\x0A] | |
//BeginAttribeValue = {S}* \= {S}* | |
LineTerminator = \r|\n | |
// Z is the single-byte zero character to be used in parsing double-byte files | |
Z = (\x00)? | |
S_UTF = {Z}{S}{Z} | |
BeginAttributeValueUTF = {S_UTF}* \= {S_UTF}* | |
%state ST_XMLDecl | |
%state CHARSET_RULE | |
%state QuotedAttributeValue | |
%state DQ_STRING | |
%state SQ_STRING | |
%state UnDelimitedString | |
%% | |
<YYINITIAL> | |
{ | |
{UTF16BE} {hasMore = false; return EncodingParserConstants.UTF16BE;} | |
{UTF16LE} {hasMore = false; return EncodingParserConstants.UTF16LE;} | |
{UTF83ByteBOM} {hasMore = false; return EncodingParserConstants.UTF83ByteBOM;} | |
// force to be started on first line, but we do allow preceeding spaces | |
^ {Z}({S}{Z})* ({Z}<{Z}\?{Z}x{Z}m{Z}l{Z}){S_UTF}+ {if (yychar == 0 ) {yybegin(ST_XMLDecl); return XMLHeadTokenizerConstants.XMLDeclStart;}} | |
^ {Z}({S}{Z})*({Z}@{Z}c{Z}h{Z}a{Z}r{Z}s{Z}e{Z}t{Z}) {if (yychar == 0 ) {yybegin(CHARSET_RULE); return CSSHeadTokenizerConstants.CHARSET_RULE;}} | |
} | |
// I don't think there's really an XML form of CSS files ... but will leave here for consistency | |
<ST_XMLDecl> | |
{ | |
//"version" {BeginAttribeValue} {pushCurrentState(); yybegin(QuotedAttributeValue); return XMLHeadTokenizerConstants.XMLDeclVersion;} | |
{Z}e{Z}n{Z}c{Z}o{Z}d{Z}i{Z}n{Z}g{Z} {BeginAttributeValueUTF} {pushCurrentState(); yybegin(QuotedAttributeValue); return XMLHeadTokenizerConstants.XMLDelEncoding;} | |
// note this "forced end" once end of XML Declaration found | |
{Z}\?{Z}>{Z} {yybegin(YYINITIAL); return XMLHeadTokenizerConstants.XMLDeclEnd;} | |
} | |
<CHARSET_RULE> | |
{ | |
{S_UTF}* {pushCurrentState(); yybegin(QuotedAttributeValue);} | |
{Z};{Z} { yybegin(YYINITIAL); hasMore = false; return CSSHeadTokenizerConstants.RuleEnd;} | |
} | |
<QuotedAttributeValue> | |
{ | |
{Z}\"{Z} { yybegin(DQ_STRING); string.setLength(0); } | |
{Z}\'{Z} { yybegin(SQ_STRING); string.setLength(0); } | |
// in this state, anything other than a space character can start an undelimited string | |
{S_UTF}*. { yypushback(yylength()); yybegin(UnDelimitedString); string.setLength(0);} | |
} | |
<DQ_STRING> | |
{ | |
{Z}\"{Z} { popState(); valueText = string.toString(); return EncodingParserConstants.StringValue; } | |
{Z}{LineTerminator}{Z} { yypushback(yylength());popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue;} | |
{Z}\?{Z}>{Z} { yypushback(yylength()); popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue;} | |
{Z}<{Z} { yypushback(yylength());popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue;} | |
{Z}>{Z} { yypushback(yylength());popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue;} | |
{Z}\/{Z}>{Z} { yypushback(yylength()); popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue;} | |
{Z};{Z} { yypushback(yylength()); popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue; } | |
[^\x00] { string.append( yytext() ); } | |
} | |
<SQ_STRING> | |
{ | |
{Z}\'{Z} { popState(); valueText = string.toString(); return EncodingParserConstants.StringValue;} | |
{Z}{LineTerminator}{Z} { yypushback(yylength());popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue;} | |
{Z}%{Z}>{Z} { yypushback(yylength());popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue;} | |
{Z}<{Z} { yypushback(yylength());popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue;} | |
{Z}>{Z} { yypushback(yylength());popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue;} | |
{Z}\/{Z}>{Z} { yypushback(yylength()); popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue;} | |
{Z};{Z} { yypushback(yylength()); popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue; } | |
[^\x00] { string.append( yytext() ); } | |
} | |
<UnDelimitedString> | |
{ | |
{S_UTF} { yypushback(yylength());popState(); valueText = string.toString(); return EncodingParserConstants.UnDelimitedStringValue; } | |
{Z}{LineTerminator}{Z} { yypushback(yylength());popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue;} | |
{Z}\?{Z}>{Z} { yypushback(yylength());popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue;} | |
{Z}<{Z} { yypushback(yylength());popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue;} | |
// these are a bit special, since we started an undelimit string, but found a quote ... probably indicates a missing beginning quote | |
{Z}\'{Z} { yypushback(yylength());popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTermintatedUnDelimitedStringValue;} | |
{Z}\"{Z} { yypushback(yylength());popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTermintatedUnDelimitedStringValue;} | |
{Z}>{Z} { yypushback(yylength());popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue;} | |
{Z}\/{Z}>{Z} { yypushback(yylength()); popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue;} | |
{Z};{Z} { yypushback(yylength()); popState(); valueText = string.toString(); return EncodingParserConstants.UnDelimitedStringValue; } | |
[^\x00] { string.append( yytext() ); } | |
} | |
// The "match anything" rule should always be in effect except for when looking for end of string | |
// (That is, remember to update state list if/when new states added) | |
.|\n {if(yychar > MAX_TO_SCAN) {hasMore=false; return EncodingParserConstants.MAX_CHARS_REACHED;}} | |
// this rule always in effect | |
<<EOF>> {hasMore = false; return EncodingParserConstants.EOF;} |